<template>
  <div class="permission-container">
    <div class="app-container">
      <!-- 表格 -->
      <el-card>
        <div style="text-align: right; margin-bottom: 20px">
          <el-button type="primary" size="small" @click="hAdd(1,'0')">添加权限</el-button>
        </div>
        <!-- 树形结构属性 row-key="id"-->
        <el-table border :data="list" row-key="id">
          <el-table-column label="名称" prop="name" />
          <el-table-column label="标识" prop="code" />
          <el-table-column label="描述" prop="description" />
          <el-table-column label="操作">
            <template #default="{row}">
              <el-button v-if="row.type===1" type="text" @click="hAdd(2,row.id)">添加</el-button>
              <el-button type="text" @click="hEdit(row)">编辑</el-button>
              <el-button type="text" @click="hDel(row.id)">删除</el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-card>
      <el-dialog
        :visible.sync="showDialog"
        :title="isEdit?'编辑':'添加'"
        @closed="resetForm"
      >
        <!-- 表单内容 -->
        <el-form ref="perForm" label-width="100px" :model="formData" :rules="rules">
          <el-form-item label="权限名称" prop="name">
            <el-input v-model="formData.name" />
          </el-form-item>
          <el-form-item label="权限标识" prop="code">
            <el-input v-model="formData.code" />
          </el-form-item>
          <el-form-item label="权限描述" prop="description">
            <el-input v-model="formData.description" />
          </el-form-item>
          <el-form-item label="权限启用">
            <el-switch
              v-model="formData.enVisible"
              active-text="启用"
              active-value="1"
              inactive-text="不启用"
              inactive-value="0"
            />
          </el-form-item>
        </el-form>

        <template #footer>
          <div style="text-align: right;">
            <el-button @click="showDialog = false">取消</el-button>
            <el-button type="primary" @click="hSubmit">确定</el-button>
          </div>
        </template>
      </el-dialog>
    </div>
  </div>
</template>

<script>
import { addPermission, delPermission, getPermissionList, updatePermission } from '@/api/permission'
import { getTreeData } from '@/utils'

export default {
  name: 'Permission',

  data() {
    const validCode = (rule, value, callback) => {
      // 添加时的校验：code不能重复
      let existCodeList = this.originList
      if (this.isEdit) {
        // 编辑时的校验: code能取自己
        existCodeList = this.originList.filter(item => item.id !== this.formData.id)
      }
      existCodeList.map(it => it.code).includes(value)
        ? callback(new Error(value + '已经占用'))
        : callback()
    }

    const validName = (rule, value, callback) => {
      // 添加时的校验： 名字不能取子元素的名字
      let existNameList = this.originList.filter(item => item.pid === this.formData.pid)
      if (this.isEdit) {
        // 编辑时的校验： 名字不能取兄弟（排除自己）的名字
        // 找兄弟，排除自己
        existNameList = this.originList.filter(item => item.pid === this.formData.pid && item.id !== this.formData.id)
      }
      existNameList.map(it => it.name).includes(value)
        ? callback(new Error(value + '已经占用'))
        : callback()
    }
    return {
      isEdit: false,
      originList: [],
      list: [],
      showDialog: false, // 是否显示弹层
      formData: {
        name: '', // 名称
        code: '', // 权限标识
        description: '', // 描述
        enVisible: '0', // 开启
        pid: '', // 添加到哪个节点下
        type: '' // 类型
      },
      rules: {
        name: [{ required: 'true', message: '请输入名称', trigger: 'blur' }, { validator: validCode, trigger: 'blur' }],
        code: [{ required: 'true', message: '请输入内容', trigger: 'blur' }, { validator: validName, trigger: 'blur' }],
        description: [{ required: 'true', message: '请输入描述', trigger: 'blur' }]
      }
    }
  },
  created() {
    this.loadPermissionList()
  },
  methods: {
    hSubmit() {
      this.$refs.perForm.validate(valid => {
        if (!valid) return
        this.isEdit ? this.doEdit() : this.doAdd()
        this.showDialog = false
      })
    },
    async doEdit() {
      try {
        const res = await updatePermission(this.formData)
        if (res.code !== 10000) return
        this.$message.success(res.message)
        this.loadPermissionList()
      } catch (error) {
        console.log(error)
      }
    },
    hEdit(row) {
      this.isEdit = true
      this.showDialog = true
      this.formData = { ...row }
    },
    async hDel(id) {
      try {
        const res = await delPermission(id)
        if (res.code !== 10000) return
        this.$message.success(res.message)
        this.loadPermissionList()
        // 保存数据
      } catch (err) {
        console.log(err)
      }
    },
    // 重置表单
    resetForm() {
      this.formData = {
        name: '', // 名称
        code: '', // 权限标识
        description: '', // 描述
        enVisible: '0', // 开启
        pid: '', // 添加到哪个节点下
        type: '' // 类型
      }
      this.$refs.perForm.resetFields()
    },
    async  doAdd() {
      try {
        const res = await addPermission(this.formData)
        // console.log(res)
        if (res.code !== 10000) return
        this.$message.success(res.message)
        this.loadPermissionList()
        this.showDialog = false
      } catch (error) {
        console.log(error)
      }
    },
    hAdd(type, id) {
      this.showDialog = true
      // 记录当前添加的关键信息
      this.formData.type = type
      this.formData.pid = id
      this.isEdit = false
    },
    async loadPermissionList() {
      const res = await getPermissionList()
      // console.log('从后端获取的数据的是', res)
      this.list = getTreeData(res.data)
      this.originList = this.list.map(item => {
        const { pid, id, name, code } = item
        return { pid, id, name, code }
      })
    }
  }
}
</script>
